| Description | Says that the penicillin samples from Coghill (Peoria) had lost activity but Oxford standard had stayed constant - says Miss Hold assayed samples being taken to Florey and found some serious discrepancies between her values and those on labels - gives details - says Charlton has B.subtilis assay working well - gives details of his work on Crepis - quotes from letter from Brit.J.exp.Path rehecting Florey's paper. |